In reply to mypyrex: Yep I do them alot, it takes time to pay out though although I have had a few nice bits. The only reliable sites I have found are
www.ukcompetitions.com
And on the money saving expert is a great comp forum, found here,
http://forums.moneysavingexpert.com/forumdisplay.php?f=72
If you go to the money saving one, go to the bottom of the forum and change the criteria to
Sort by Thread title
Then ascending order
This should give you the comps that are ending soonest at the top.
You do have to put the hours in though and also not many people enter ones where effort is required, like pictures or poems, so they are always better to enter.